Reversible seat-back base



A. B. BELL April 18, 1939.

REVERSIBLE SEAT-BACK BASE Filed Nov. l, 1935 4 Sheets-Sheet l April 18, 1939. A. B. BELL REVERSIBLE SET-BACK BASE Filed Nov. 1, 1935 4 Sheets-Sheet 2 Apri118, 1939. A1B. BELL l REVERSIBLE SEAT-BACK BASE Filed Nov. l, 1935 4 Sheets-Sheet 3 April 18, 1939. "A. B. BELL REVERSIBLE SEAT-BACK BAS E` 4 Sheets-Sheet 4 Filed Nov. l, 1935 Patented Apr. 18, '1939 UNITED STATES PATENT oEFicE 2,154,600 Y REVERSIBLE SEAT-BACK BASE Alfred B. Bell, Gardner, Mass., assignor to Heywood-Wakefield Company, Gardner, Mass., a corporation of Massachusetts Application November 1, 1935, Serial No. 47,820 10 Claims. (Cl. 155-96) This invention relates to reversible seat bases seat itself to impart reversing movement thereto. adapted for use in vehicles such as railway cars, According to the invention, stabilizing mechanism busses and the like, wherein the seat can be adequate for the reversing movement of the seat rotated through an angle of about 180 about a isprovided, this mechanism being augmented by vertical axis so as to face one or the other end additional stabilizing rmechanism effective when 5 of the vehicle. It is desirable in a seat base of the seat is in either of its positions for use. this general type, that the mechanism be capable A further object of the invention is to provide, of economical construction involving lightness in combination with the link type f reversing of weight and mechanical strength, the latter mechanism hereinbeiore referred to, an improved V being necessary to withstand the jolts and lurches Seat-tilting IneChaniSIn including a Vertical of a vehicle in which the base is mounted. 'I'he plunger Which riCleS 0n a Xed Cam track, the movements of the passengers occupying the seats, plunger being moved laterally by the reversing resulting from such jolts and lurches, impose movement of the seat-supporting frame, and stresses of considerable magnitude on the base being moved vertically to tilt the seat by the con- .3 structure, so that, unless the base is constructed tOur 0f the Cam track 0n Which it rides. The cam l5 to withstand successfully such stresses, it is liable track and plunger are so arranged as not to interto go to pieces or to get out of order in a short fere With the InOVeInent 0f the Connectingy links time, by which the reversing movement of the movable It is an object of the present invention to proframe iS C0ntr0lled. 2o vide a reversible car-seat base of the type referred VarlOuS Other improvements hereinafter more 20 to, this base being of light Construction but being particularly described are included in the invenstrong and rigid by reason of the arrangement tiOn illustrated 0n the dra/Wings 0f Which and interengagement of the parts thereof. It is Figure 1 iS a plan View of a reversible seat base a further object of the invention to provide a carembodying the invention- 25 seat base such that the seat will be rmly secured Figure 2 iS a Side eleVatiOn 0f the Sarne- 25 in either of its positions for use, and, when in Figure 3 iS un end eleVatiOn ofthe same. such positions, will be angularly alined with the Figure 4 is a fragmentary plan View 0f the Stastationary portion of the base, tionary frame shown in Figure 1, together with The invention relates more particularly to the the links mOi-interi thereon. :io type of car-seat-base mechanism which includes Figure 5 is a Section on the line 5-5 of Figure 1. so

a stationary pedestal or frame over which a seat- Figure 6 iS a SeCtiOn 0n the line 5-6 0f Figure 1. supporting frame is movable in a horizontal Figure '7 iS a SeetiOnal VieW Similar t0 Figure 6, plane, the two frames being connected by a pair showing a modied form of structure. 0f unks which are in .the form of cranks and Figure 8 is a section on the line 8-8 of Figure 2.

3;, which control the reversing movement of the Figure 9 is a plan VieW 0f e modified form 0f S5 movable frame. These links are pivoted at one CareSeut base end to the xed frame and at the other end to Figure 10 iS a Side elevation of the same. the movable frame, the pivot points being so ar- Figure 11 is e fragmentary elevation of a porranged that, during the initial portion of a retion of the mechanism Shown in Figure 10, on a 4g versing movement of the seat from one of its posilarger Scale 40 tions for use, the seat moves endwise away from Figure 12 iS a SeCtiOu taken 0n the line l 2| 2 the wall of the vehicle, and, during the final por- 0f Figure 11. tion of the reversing movement, the seat moves Figure 13 iS Similar t0 Figure 11 but ShOWs a endwise toward the vehicle wall until it reaches modified form 0f Structure- 45 its other position for use. Figure 14 is a plan view of a further modified [g5 Ordinarily, when aseat is reversed from one form 0f Cer-Seat beseposition to another, it is unoccupied, so that there Figure 15 iS e Side elevation of the same. is then not so much need for strong structure to Figure 16 iS a SeCtiOn 0n the line IGV-I6 of stabilize the seat as there is when the seat is in Figure 14. c 5g either of its positions for use, particularly if the Figure 17 1S e SeCtiOn 0n the line '7*17 0f c seat and its supporting frame are relatively light. Figure 14 However, a certain amount of stabilization is Figure 18 iS a plan VieW 0f another form of carnecessary even when the seat is being reversed. seat base. t since it is then subjected at times to considerable Figure 19 is a side elevation of the same.

g,V stresses arising from the eiort exerted on the Figure 20 is anend elevation of the same.

Figure 2l is,a fragmentary section of the stationary portion of the base showing an improved method of welding.

The car-seat base, illustrated in Figures l, 2 and 3, includes a stationary frame which, as shown, may consist of a pair of horizontal angle irons or rails having suitable brackets 3| at one end thereof to be secured to a shelf or bracket on the wall of the vehicle. The other ends of the rails 33 may be supported by a suitable pedestal 32. Such structure affords stowage space beneath the seats for parcels, suit cases, and the like. It is evident that, if desired, a central pedestal may be substituted for the wall brackets 3l and the end pedestal 32. Secured between the central portions of the rails 3G is a horizontal connecting plate 35, as much as possible of this plate being preferably cut away to econoinize in weight and materials. Pivotally mounted on the plate 35 are a pair of links 36, these links being preferably in the form of cranks having a crankshaft portion 31 journaled in the plate 35 to rock on a vertical axis, each link also having a crankpin portion 38 at its opposite end journaled in a seat-supporting frame which is movable in a horizontal plane above the stationary frame of the rails 3i] and connecting plate 35. The xed pivot axes of the links 33 are arranged, as indi- V cated in Figure l, in a front-to-rear line intersecting the rails 33. When the seat is in either position for use, the movable pivot axes, where the crank-pin portions of the links are journaled in the movable frame 45, are arranged in a line perpendicular to the line of centers of the fixed pivot. The links 35 control the reversing movement of the frame 43 and of the seat carried thereby. Thus, when the seat is reversed from one position for use to the reverse position, the seat and frame 40 move initially endwise toward the aisle and continue such motion during the early part of the turning movement of the frame 45. When the frame has swung past a 90 angle of rotation, a reverse movement toward the wall of the vehicle begins, the last portion of the movement of the frame 4i! being directly toward the wall as it reaches its ultimate position of rest. The location of the frame 43 in its ultimate positions of rest (i. e. in the positions in which the seat is held for use) may be mechanically determined in various ways. As illustrated in Figure l, a stop element 42 may be mounted on the plate 35, this element being shown in the form of a xed pin which projects upward from the plate. This stop element is adapted to be engaged by an extension 43 on each link 35, the extension preferably having an arcuate recess 44 to fit against the cylindrical pin and to prevent any longitudinal movement of the link which might be permitted by a worn bearing at its ixed pivot. When the extension 43 of one of the links-35 is against the stop element 42,the frame 4G may be locked in such position by suitable locking mechanism such as a vertical plunger 45 which is slidably mounted on a portion of the fixed plate 35. The upper end of the plunger is adapted to enter a suitable recess 41 in the frame 4o, two such recesses being provided for alternative cooperation with the plunger 46 when the frame 4i! is at one or the other eXtreme position.

When it is desired to reverse the seat, the locking plunger 45 must be retracted from the recess 41 in which it is engaged. This may conveniently be done by a treadle 50 having attached thereto a pin 5i mounted in the plunger 46 and passing through slots in the treadle 55. Depression of the treadle 50 pushes the plunger down against a suitable spring 53 so as to release the frame 40 for reversing movement. The reversing movement of the frame 40 swings away from the stock member 42 the link 36 of which is in contact therewith, and eventually brings into contact with the stop 42 the extension 43 of the other link 36. During the reversing movement of the frame, the upper end of the plunger slides against the lower face of some portion of the frame 40 so that the treadle is maintained in its depressed position, thus permitting the foot-rests (not shown) to clear the treadle when they swing past. When the opposite recess 41 moves into registry with the plunger 46, the plunger springs up into locking position if the operators foot has in the meantime been taken oif the treadle.

Ii desired, the treadle 50 may be dispensed with. In such case, the plunger 45 is made to engage in a shallow recess 41, as shown in Figure '1, from which it can ride out when the seat frame 40 is given a sumcient push or pull. The upper end of the plunger then slides against the lower face of the frame 43 until it enters the opposite recess 41 when the reversing movement ofthe seat has been completed. The path followed by the plunger 46 on the under face of the frame 40 may be smooth by machining or grinding portions of the under face of the frame traversed by'the plunger.

During the reversing movement of the frame 43, various stresses are apt to be imposed of the links 35. To reinforce the links against such stresses, hold-down elements are provided thereon. As shown, these elements may consist of ier-rules 55 rotatably carried by bolts 56 each of which also carries a washer 51 `under the lower end'of the ferrule 55 and a spring sleeve 58 between the washer and the under face of the link 36. Each bolt and sleeve extends downward from an intermediate point of a link 35 through an arcuate slot 39 in the plate 35. rIhe slots 60 are concentric with the iixed pivot axes 0f the links so that the bolts 56 are adapted to travel in the slots Sii as the links 36 rock about their fixed pivots. The ferrules 55, as indicated in Figure 5, engage under the edges of the slots and thus act with the washers 51 as hold-down members to protect the links 36 against some of the stresses imposed thereon during reversing movement of the frame 40.

In order to stabilize the frame 4D against any looseness or wabbling when the seat is in either position for use, wedge members 62 may be secured to the four corners of the frame 4U to cooperate with stop elements 64 mounted on the rails 30. Each stop element 64 is provided with a tapered opening 66 adapted to receive one end portion of a wedge element 52. rlhe stop elements 64 are preferably secured to the rails 30 by bolts 5S which pass through slots 10 in the rails 30 so that each of the stop elements 64 may be adjusted along its rail 35. Thus, 'in setting up the seat and seat base, the frame 40 may be moved into one of its extreme positions wherein one of the links 35 is in contact with the stop element 42. Stop elements 64 are then adjusted so as to be in closely tted engagement with respective wedge elements 32. Thus the seat 'is eiectively and rigidly anchored directly to the rails 3l) and all looseness or wabbling, while the seat is in use, is entirely avoided. In order to assist the hold-down elements on the links 36 in stabilizing the seat during reversing movement thereof, a guide rail 15 may be mounted on the rails 30. As

`The plate 95 is of irregular j of the projections shown, this guide rail is arcuate in shape and is adapted to serve as a track on which the frame 48 may slide as it rotates. The ends of the guide rail 'l5 may be beveled as at 16 so as to guide an approaching portion of the frame 40 up onto the upper surface of the rail. strength, the frame 49 maybe made in the general form of an X, as shown in Figure 1, the seat being secured to the extremities of the X. To make the seat available for occupancy when swung half-way between its limiting positions, the hold-down elements on the links 35 may be 18 forming a of its limiting positions.

In order to provide strong connections between the links and the frames which they connect, the frames may be made with cylindrical bearing portions in which are journaled the crank-shaft and crank-pin portions of therlinks. The links are secured in place by washers or plates bolted to the ends of the crank-shaft and crank-pin portions thereof. Since the links oscillate in opposite directions during the successive reversing movements of the seat, the bolts are liable to work loose unless suitable provision` is made to prevent such working. As illustrated in Figure 8, the crank-pin portion 38 of the link 35 is journaled in a bearing portion 8|) of the frame 4G. In order to hold the frame 4|! on the links: 95, a washer 82 is secured as by a bolt 84 to the end of the crank-pin portion 38 of the link. The latter is provided with a small recess 85 in its 354 end face which receives a lug 88 struck up from the Washer or plate 82. The lug 88, engaging in the recess 86, prevents rotation of the plate 82 relative to the crank-pin portion 38 of the link so that there is no tendency on the part of the plate 82 to work the bolt 84 loose.

A somewhat modified form of the invention is illustrated in Figures 9 to 13. This formv of seat base may be provided with a stationary frame consisting of horizontal rails 30 supported at one nd on the Wall of the vehicle and at the aisle end by a pedestal 32. A seat-supporting frame 95 is movable in a horizontal plane between two limiting positions, the movable frame being connected to the stationary frame by a pair of links Q2. The

,links 92 are preferably of the crank type as are the links 3B shown in Figure l, but are preferably arcuate in shape to avoid interference with a seat-tilting plunger. The links 92 are rockable about vertical axes at pivot points 94, the crankshaft portions of the links being journaled in suitable bearings on a fixed plate 95 which is secured to the rails 30 and extends between them. shape, the central portion being largely cut away to accommodate a cam-track member |55. This member is secured to the plate 95 as by bolts |92 which extend through slots in the plate so as to permit adjustment of the cam-track member |98 in a direction parallel to the rails 30. The cut-away por- .l tions of the plate 95 leave three horizontal horns or projections H9, H2 and ||4 which project toward each other and are arranged to support the links 92 for sliding contact thereon. In ord-er that the links 92 may engage one or the other ||2 or ||4 before moving clear of the projections |||J, each link may be provided with a horizontally projecting tongue I5, the tongues llt` being adjacent to the free ends of the links.- Also at the free ends of the links tare suitable projections |20 which are notched For lightness and* for engagement with a stop element |22 mounted on the plate 96 soy as to determine accurately the limiting positions of the frame 9U. The crank-pin portions of the links 92 are pivoted as at |24 to the fram-e 9|), the arrangement of the pivots being preferably similar to the arrangement of 'the pivots in the seat base illustrated in Figure l. The movable frame 90 may be in the form of an X, a pair of reinforcing elements |25 being provided to ride on a guide rail secured across the rails near the aisle end of the base. Between the ends of each link S2 is mounted a hold-down element co-nsisting of a ferrule |32 mounted on a bolt |34 which projects through the link 92. The ferrule engages under an arcuate edge portion |35 of the plate 96, these edge portions being concentric with the pivot axes 94.

When the frame 90 is in either limiting position, it is stabilized by the engagement of wedging elements 62, mounted at the four extreme ends of the frame, with adjustable hold-down elements 54 secured to the rails 3|).

The frame 90 is adapted to carry a seat which is preferably hinged thereto as at M8, the hinge axis being adjacent to the forward edge of the seat. The rear edge of the seat is adapted to rest on a pair of brackets |42 secured to or integral with the frame 9|). In order to tilt the seat forward as it is reversed from one position to the other, suitable mechanism may be provided including a vertical movable plunger |45 of adjustable length. This plunger may be connected to a tiltable seat (not shown.) at some point rearward of the axis of the hinges |49, in a manner Well known in the art. As shown, the lower end of the plunger |45 is in the form of a ball |45 above which is a reduced neck |48. The ball Mt is adapted to ride on the cam: track i90, so that, when the plunger 45 is moved laterally by reversing movement of the seat to which it is attached, the ball |45 slides along the cam track of the member |90. As indicated in Figure 9, the track l 9|) is shaped in such a manner that the plunger |45 will follow along the center line thereof` as the seat swings through its reversing movement from one limiting position to the other. As indicated in Figure l0, the contour of the track is such that the end portions are sloping while the intermediate portion is substantially level. Thus during the initial portion of the reversing movement of the seat from either of its positions, the ball |45 of the plunger rides upf an inclined portion of the cam track. This causes the plunger |45 to rise, tilting the seat so that it reaches its maximum angle of tilt before the reversing movement has progressed very far. The seat is then held in such maximum angle of tilt until the final portion of its reversing movement is reached, whereupon the ball |46 slides down Yan inclined portion of the track |09 to the position indicated in Figure ll, As therein shown, the ball |46 rests against an inclined portion of the track when the seat is in either limiting position. Since any upward movement of th-e plunger |45 must be against the weight of the seat itself and of any occupants thereof, the ball |46 acts to lock the seat against any reversing movement owing to the fact that the ball rests against the sloping surface of the track |95. When the seat base is initially assembled, the track member 80 is adjusted in a direction parallel to the rails 39 so that the ball |45 will be in definite engagement with a sloping portion of the cam track l 09 when the seat is in either of its -limiting positions. It is desirable to lock the seat against LIU.

' form of reversible seat base.

of connecting links 4' tilting when it is in either of its positions for use. To this end, a claw-shaped locking member |50 may be mounted on the track member at a point beyond the end of the cam track itself. This member, as indicated in Figure 12, may be provided with a long finger |52 and a shorter finger |54 between which is a notch |56 adapted to receive the neck |48 of the plunger |45. The edge of the notch |56 may be beveled to iit the upper surface of the ball |46 for snug engagement therewith. The bevel on the inner edge of the finger |52 may also be provided with a projection. |60 which extends slightly into the path of movement of the upper portion of the ball |46 so that the plunger is slightly sprung as the ball passes the projection |6l. Thus the plunger snaps into and out of its limiting positions against one or the other of the claw members ||ll. This serves to hold the plunger tightly when the seat is in either position for use. Figure 13 illustrates a slightly different arrangement of the bracket end portion of the cam-track member and of the claw member which is secured thereto.

Figures 14 and 15 illustrate a highly simplified As shown, this form of seat base comprises a stationary frame including a pair of rails 3i) to which are secured a connecting plate |16. A seat-supporting plate |12 is connected to the stationary plate as by a pair |14 which are pivoted as at |16 to the plate |10 and are pivoted as at |18 to the movable plate |12. The stationary plate |13 is provided with elevated track portions |8i3 adapted to support the free end portions of the links |14 which slide thereon. The links |14 and their pivots may be arranged in a manner similar to the links shown in Figures 1 and 9. Each of the links |14 is provided with a pair of projections |32 at the free end thereof, each projection having an arcuate recess |84 to receive a stop pin |36 which is mounted on the stationary plate |18. Only one of the projections |82 on each link is active, the other projection being formed thereon, if desired. so that the links may be interchangeable with each other, thus avoiding rights and lefts. As indicated in Figure 16, the stop element |86 may be provided with a flange |92 under which the projections iSZ engage so that the 'flange |90 acts on the adjacent projection |82 as a hold-down element to stabilize the seat. In order to maintain the seat r-eleasably in one or the other of its limiting positions, each link |14 may be provided with a hollow |22 in its under face near the free end thereof. This hollow is adapted to receive the rounded upper |94 of a resilient detent |95 which is mounted in the plate i153 and is pressed upward as by a spring |98. A sufficient pull on the seat will force the detent element |95 downward so as to release the seat from reversing movement. When the seat reaches either of its limiting positions, one or the other of the links |14 will move over the detent element |95 which will thereupon enter the recess E92 and hold the seat in place. Figure 11 illustrates the manner in which the movable plate |12 may be secured to the crank-pin portions of the links |14, the structure being similar to that illustrated in Figure 8 except that the end of the crank-pin portion of each link is hollowed to. receive a dished washer or plate 2li) so that the heads of the bolts will not project so far above the bearing portions of the plate |12. As shown, the washer 2 D is locked to the link stud |14 by a lug 2|2 thereon which end portion engages in a recess 2|4 in the link stud so as to keep the bolt |18 from working loose. v

Figures 18, 19 and 20 illustrate a seat base having a central pedestal 23D of rectangular shape. This pedestal consists of a top plate 232 which is preferably a malleable casting, and side walls 234 Whiclr are preferably of rolled sheet steel and are welded to the top plate as follows. The top plate 232 is provided with a peripheral beading or flange 235. Spaced inward from this beading are a number of lugs 240 forming with the beading 236 short channels 242. If preferred, the lugs 240 may be in the form of continuous ridges. The spaced lugs, however, are preferred on account of economy in weight and material. The channel 242, as indicated in Figure 2l, is considerably wider than the thickness of the sheet-metal side walls 234. In order tosecure the side walls 234 to the top plate 232, the upper edges of the side Walls are inserted in the channels 242 in such a manner that the side walls are inner face of the beading 236. This leaves considerable clearance between the inner surface of the side walls and the lugs 240. Welding metal is then welded into this clearance so as to fill the same as indicated at 250. If arc-welding be employed, the arc may be made between the welding wire and the lug 240. If properly done, this avoids over-heating of the relatively thin sheet metal 234 or warping of top casting so that a firm weld between the top and sheet metal side walls is thus obtainable.

The top surface of the top plate 232 is preferably planc so that a movable seat-supporting frame can be slidably supported thereon. As shown, the movable frame 252 consists of a disklike portion directly resting on the top` plate 232, a plurality of seat-supporting arms 254 radiating from the disk. The periphery of the disk is provided with a pair of diametrical opposed notches, one of which receives a fixed stop element 256 and the other of which receives a vertically movable plunger 26|). This plunger may be retracted by a suitable treadle 262 to release the movable frame 252 and to permit the s'eat carried thereby to be reversed. The stop element and plunger, fitting snugly in the notches in the periphery of the disk, hold the disk firmly against any movement on the top plate 232 when the seat is in either position for use and also ensure accurate angular alinement of the seat frame with the base. The stop element 256 may be provided with a liange 264 adapted to overlap a portion of the disk so as to act as .a hold-down element when the seat is in either of its limiting positions for use. Additional hold-down elements 265 may be mounted at the side edges of the base, these hold-down members being bolted or otherwise attached to laterally projecting lugs 263 so as to permit movement of the movable frame 252 in its o-wn plane during reversing movement of the seat. The hold-down elements 266 may each be provided with a flange 210 adapted to engage under the edge of the corresponding lug 258 so as to prevent the hold-down elements 256 from 'becoming loose and permitting wabbling of the movable frame 252 on the toprplate 232. The top plate may be provided with an extended portion 212 projecting toward the aisle so as to support av peripheral portion of the movable disk when the seat is half-way between its reversed positions. Secured to this projecting portion 212 of the top plate is a hold-down member 214 which is adapted to cooperate 'with the hold-down members 266 so as to prevent wabbling of the movable frame held against the 252 when it is half-Way between its limiting positions. Thus the seat may be occupied, ii desired, when it is in position facing the side wall of the vehicle.

The foregoing description of certain embodiments defined in the following claims.

I claim:

1. A reversible car-seat base comprising a stationary frame including a horizontal member having two arcuate edge portions in a common element on each said link between the ends thereof, each said hold-down element having a portion engaging under one of said arcuate edges.

thereof.

3. A reversible car-seat base comprising a stationary frame, a movable frame slidable thereon, a pair of links each pivoted at one end to said stationary frame and at the other end to said each link adapted to engage said stop element when the seat carried by the movable frame is in one or the other of its reversed positions, and means for locking said movable frame against movement when either said notched extension is in engagement with said fixed stop element.

4. A reversible car-seat base comprising a stationary frame having a pair of fixed pivot points arranged in a front-to-rear center line of the base, said frame including a horizontal member with a pair of arcuate slots concentric with said fixed pivot points, a seat-supporting frame movable in a horizontal plane above said stationary frame and provided with a pair of spaced pivot points having their line of centers perpendicular to the line of centers of the xed pivots when the its positions for use, a pair of links pivotally connected to said stationary pivot points and to said seatsupporting frame at its pivot points, hold-down elements on said links projecting through said slots and engaging under the edges thereof, and notched extensions on said links adapted to engage said stop element when the seat is in either position for use. l

5. A reversible car-seat base comprising a stationary frame, a. movable seat-supporting frame, a pair of connecting links each pivoted at one to rock thereon in a horizontal plane and at the other end to said movable frame, a stop element on said stationary frame, an extension on said link adapted to engage said stop element when the seat is in-one or the other of its positions for use, said stop element having a portion overlapping a portion of said link extension in engagement therewith so as to act as a hold-down element, and means releasably holding said movable frame against movement when either link extension is in engagement with said stop element.

6. A reversible car-seat base comprising a stationary frame, a movable seat-supporting frame, a pair of connecting links each pivoted at one end to said stationary frame to rock thereon in a horizontal plane and atV the other end to said movable frame, a stop element mounted on said stationary frame and engageable alternatively by said links to define limits of movement of said movable frame, said stop element having a portion overlapping a portion of the link in contact therewith, and means on said stationary frame engaging and releasably locking against move- .ment the link in contact with saidstop element.

7. A reversible car-seat base comprising a stationary frame, a sea -supporting frame movable on said stationary frame in a horizontal plane, a pair of links connecting said frames, each link being pivoted to the stationary frame at one end and to the movable frame at the other end, a xed stop element on said stationary frame engaged by said movable frame when the seat is in either of its positions for use, a locking element movable into and out of the path of movement of the movable frame when the seat is in either position for use, said movable frame having a pair of lateral recesses arranged to receive said stop element and locking element when the seat is in a position for use.

8. A reversible car-seat base comprising a stationary frame, a seat-supporting frame movable in a horizontal plane on said stationary frame to reverse the seat carried thereby, a pair of links connecting said frames, each link being pivoted at one end to the stationary frame and at the other end to the movable frame, a track member secured to said stationary frame having a cam track on the upper surface thereof, and a seat-tilting cam follower laterally movable along said cam'track by movement of said movable v frame and vertically movable by the contour of the cam track. v l

9. A reversible car-seat base comprising a stationary frame, a seat-supporting frame movable in a horizontal plane over said stationary frame to reverse the seat carried thereby, means operatively connecting said frames to determine the reversing movements of said movable frame, a track member adjustably secured to said stationary frame having a cam track on the upper surface thereof, a vertically disposed plunger movable laterally along said track by movement of said movable frame and vertically movable by the contour of the track to tilt a seat hinged to said movable frame, said plunger having its lower extremity in the shape of a ball and a reduced connecting neck, and means for locking said plunger against vertical movement when the movable frame reaches either limit of its movement, said locln'ng means including a claw adjustably iixed above said track to receive the reduced neck of the plunger, said claw having a portion projecting slightly into the path of neck whereby said plunger is sprung into andout ci its locked engagement with said claw.

10. A reversible car-seat base comprising a stationary frame including a pair of parallel rails and a connecting member secured between said rails, said connecting member having three spaced bearing elements projecting toward each other and having upper bearing surfaces in a common horizontal plane, said connecting member also having a pair of fixed pivot points and arcuate edge portions concentric with said points, a cam-track member secured to said connecting member and disposed in the spaces between said three bearing elements, a pair of links pivotally attached to said frame at said pivot points for movement in a horizontal plane, the free end portions of said links being at all timesdirectly supported by some portion oi said connecting member, a movable frame member pivotally attached to spaced points to the free ends of said links whereby the reversing movement or" said movable frame is controlled by said links, a xed reaches either limit of its movement to lock said plunger againstvertical movement.

ALFRED IBr BELL. 

